Please help me

I have installed many different private servers and flash players and every single time i try to open up a private server it doesn't work. I have put the private servers into trust the location and it still gives me the language error. I am getting mad can someone help me? I have windows 7, I don't like black screens so please help

Private servers aren't on 24/7. The majority are normally offline due to crashes etc.

If you want to play a private server without this error, you've honestly just gotta set one up yourself